For the Walther PDP Compact, the Holosun SCS-PDP is a top choice for a clean, direct-fit low mount without a plate, while the Trijicon RMR Type 2, Holosun 507C/509T, and SRO are excellent, rugged options requiring an adapter plate, offering features like enclosed emitters (509T, SRO), large fields of view (507 Comp, SRO), or versatile reticles (Holosun ACSS) for duty, competition, or concealed carry. Your best bet depends on budget, feature needs, and whether you prefer a low co-witness or the direct-mount profile, with Holosun often offering great value and Trijicon supreme durability.

Try here: https://freedomgorilla.com/collections/walther-pdp-pdp-compact-optics?srsltid=AfmBOoro3PPCsUfEQg-HSnwwqPfgWVe5G7TNwunfDq1_CPcocncuQkDQ

I put a Holosun green dot on my Walther PDP and I love it. Holosun model HE407C-GR X2. https://imgur.com/a/mC3j67t

Good afternoon to you!! Please see below link to better find what you are looking for. I hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸
https://egwguns.com/red-dots-mounts/red-dot-mounts/

Hi Dave and welcome. This is one of the best guides going online to narrow down the best Optic for your Walther Arms PDP Compact Optic Ready Pistol--- https://freedomgorilla.com/collections/walther-pdp-pdp-compact-optics?srsltid=AfmBOoro3PPCsUfEQg-HSnwwqPfgWVe5G7TNwunfDq1_CPcocncuQkDQ ----------- Cheers, stay safe and enjoy!